【简答题】For all of the following questions: DO NOT type your answers into MyLO. There are many questions in this test. If you set up your spreadsheet correctly, you will have plenty of time to complete it. If...
【单选题】下列结论中,错误的有( ) 1在Rt△ ABC 中,已知两边长分别为3和4,则第三边的长为5; 2△ ABC 的三边长分别为 AB , BC , AC ,若 BC 2 + AC 2 = AB 2 ,则∠ C =90°; 3在△ ABC 中,若∠ A :∠ B :∠ C =1:5:6,则△ ABC 是直角三角形; 4若三角形的三边长之比为3:4:5,则该三角形是直角三角形;